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[Pattern visual evoked potentials in normal-vision eyes of post-therapy amblyopia]
Manyi Xiao1, Xin Wei, Yunping Li
1Department of Ophthalmology, Second Xiangya Hospital, Central South University, Changsha 410011,China.
Insights
Pattern visual evoked potential (P-VEP) testing reveals persistent visual pathway deficits in amblyopic patients even after successful pleoptic therapy. These P-VEP abnormalities in amblyopic and fellow eyes suggest traditional treatments may be insufficient for full vision recovery.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Context:
- Amblyopia, a common cause of reduced vision in children, is often treated with pleoptic therapy.
- Assessing the long-term functional recovery after amblyopia treatment is crucial for understanding treatment efficacy.
- Pattern visual evoked potential (P-VEP) is a non-invasive neurophysiological test used to evaluate the integrity of the visual pathway.
Purpose:
- To evaluate the clinical significance of pattern visual evoked potential (P-VEP) parameters in children with amblyopia who achieved normal visual acuity after pleoptic therapy.
- To compare P-VEP findings between unilaterally and bilaterally amblyopic children and healthy controls.
- To identify factors influencing P-VEP abnormalities in treated amblyopic eyes.
Summary:
- Sixty children (8-12 years) with treated amblyopia (unilateral n=40, bilateral n=20) and 20 controls underwent P-VEP testing.
- Significant P100 wave latency prolongation and amplitude reduction were observed in both amblyopic groups compared to controls.
- Even fellow eyes in the unilateral amblyopia group showed abnormal P-VEP findings.
- Multiple linear regression indicated P100 latency was significantly correlated with initial treatment age, baseline visual acuity, and cycloplegic refraction (R²=0.52).
Impact:
- Findings suggest that pleoptic therapy, while improving visual acuity, may not fully restore visual pathway function.
- Deficits detected by P-VEP in both treated amblyopic and fellow eyes highlight the need for potentially enhanced or alternative therapeutic strategies.
- The correlation of P-VEP latency with specific clinical factors provides insights into the neurophysiological underpinnings of residual amblyopic deficits.
Objective:
To evaluate the clinical significance of pattern visual evoked potential (P-VEP) parameters on amblyopic patients with normal-vision after pleoptic therapy.
Methods:
We investigated 60 amblyopic children (8-12 years old) who gained normal-vision after pleoptic therapy. These patients were assigned to a unilateral amblyopia group (40 patients) and a bilateral amblyopia group (20 patients). Another 20 healthy children served as a control group. All patients underwent a full initial ophthalmologic and orthoptic evaluation. P-VEP test was performed in all. Amplitude and latencies were analyzed and compared among groups. The latencies of P100 waves in the amblyopic eyes were used to generate a multiple linear regression formula from sex, first treatment age, baseline visual acuity, and cycloplegic refraction.
Results:
There was no significant difference in the mean levels of best-corrected visual acuity among groups (P>0.05). A significant prolongation of the latency and a decrease of amplitude of P100 waves were observed in the unilateral amblyopia group and the bilateral amblyopia group compared with the healthy control group (P<0.05). Amplitude and latencies of the fellow eyes in the unilateral amblyopia group were abnormal compared with the healthy control group (P<0.05). Multiple linear regression analysis revealed that the latencies of P100 waves were significantly correlated with the first treatment age, baseline visual acuity, and cycloplegic refraction (R(2)= 0.52, P<0.05).
Conclusion:
Deficits exist in the fellow eyes and in normal-vision eyes after pleoptic therapy. The delayed P100 latency is affected by the first treatment age, baseline visual acuity, and cycloplegic refraction. Traditional amblyopic therapy may be not enough for vision function recovery.
